An associational study of Illinois sand prairie . gg stage, appearing laterin the season than the tv/o preceding. It ranges east of theRocky Mountains, and is probably more abundant in the eastern partof its range. Taken at the Devils Hole in bunch-grass, by Like many other species, rugosus is found on many kindsof dry habitats in the south, but in the northern part of itsrange, it is confined to isolated areas of sand. Djssosteira Carolina Linn. August, A common species of roads, but is not found in bunch-grass or bare sand area in the Havana region. This is rather sur-prising for a
An associational study of Illinois sand prairie . gg stage, appearing laterin the season than the tv/o preceding. It ranges east of theRocky Mountains, and is probably more abundant in the eastern partof its range. Taken at the Devils Hole in bunch-grass, by Like many other species, rugosus is found on many kindsof dry habitats in the south, but in the northern part of itsrange, it is confined to isolated areas of sand. Djssosteira Carolina Linn. August, A common species of roads, but is not found in bunch-grass or bare sand area in the Havana region. This is rather sur-prising for at Grand xov/er, Illinois, it was regularly found onthe sand-plain of the river beach. Those found on sand were con-spicuously lighter in color than others found on black soil, Spharap:emon v/yomingianum Thorn. A very common geophilous species of the the dominant member of its subfamily. It v/inters in theegg stage, and is mature from the middle of June probably untilfrost. A very v/idespread species, showing great geographic. variation. In the northern and eastern part of its range thespecies is confined to sandy localities. It is not found in blow-sand or blowouts. In the eastern part of its range it probablyis more important than in the plains region, because in the eastit is free from the competition of other species adapted to aridconditions. Kestobregma thomasi Gaud. July 19. A common geophilous bunch-grass species. It is a ratheractive species, of western distribution. A late summer form. Itis common on the dry soils of southern Illinois, but toward thenorth becomes restricted to Cand, Psinidia fenestralis Serv. July 6, 19. This species is restricted to sandy areas, it is an east-ern species, not common v/est of the Mississippi. In the bunch-grass it is next to Spharagemon in abundance among the occurs rarely if at all in blowsand. In the Havana region it ismuch more abundant than it would be in similar associations fartherwest. Trimero
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